mongodb - how to build a multi operator update statement with java driver?

Question

How do I execute different updates on different fields of a single document as a single operation using java driver? Suppose I have a document like this

{
   _id: ObjectId("1234567890")
   ...
   elements: String[],
   last_user: String,
   ...
}

and I want to add a string to the elements array and update last_user. I can do it as

import static com.mongodb.client.model.Filters.*;
import static com.mongodb.client.model.Updates.*;

...

Bson filter = eq(DBCollection.ID_FIELD_NAME, new ObjectId("1234567890"));
Bson addElement = push("elements", "a new string");
Bson updateLastUser = set("last_user", "last user name");

mycollection.updateOne(filter, addElement);
mycollection.updateOne(filter, updateLastUser);

it works but those are two separate operations, and I don't actually like it at all.

I saw in this question that with the shell i can do it like this

db.mycollection.update({ "_id": "1234567890" }, 
   {
      "$push" : { "elements": "a new string" }, 
      "$set" : { "last_user": "last user name" }
   }
);

but I have no idea how I can build that single update object containing both $push and $set with java driver . I'm quite sure it's pretty simple and stupid but I can't find a solution.

s7vr · Accepted Answer · 2018-08-07 13:42:47Z

1

Use combine.

mycollection.updateOne(filter, combine(addElement,updateLastUser);

answered Aug 7, 2018 at 13:42

s7vr

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